mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-16 09:48:16 +00:00
5097915428
Python 3 requires this, and Python 2 allows it. Convert the code over to ensure compatibility with Python 3. Signed-off-by: Simon Glass <sjg@chromium.org>
130 lines
4.3 KiB
Python
130 lines
4.3 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
|
|
# Copyright (c) 2016 Google, Inc
|
|
# Written by Simon Glass <sjg@chromium.org>
|
|
#
|
|
# Handle various things related to ELF images
|
|
#
|
|
|
|
from collections import namedtuple, OrderedDict
|
|
import command
|
|
import os
|
|
import re
|
|
import struct
|
|
|
|
import tools
|
|
|
|
# This is enabled from control.py
|
|
debug = False
|
|
|
|
Symbol = namedtuple('Symbol', ['section', 'address', 'size', 'weak'])
|
|
|
|
|
|
def GetSymbols(fname, patterns):
|
|
"""Get the symbols from an ELF file
|
|
|
|
Args:
|
|
fname: Filename of the ELF file to read
|
|
patterns: List of regex patterns to search for, each a string
|
|
|
|
Returns:
|
|
None, if the file does not exist, or Dict:
|
|
key: Name of symbol
|
|
value: Hex value of symbol
|
|
"""
|
|
stdout = command.Output('objdump', '-t', fname, raise_on_error=False)
|
|
lines = stdout.splitlines()
|
|
if patterns:
|
|
re_syms = re.compile('|'.join(patterns))
|
|
else:
|
|
re_syms = None
|
|
syms = {}
|
|
syms_started = False
|
|
for line in lines:
|
|
if not line or not syms_started:
|
|
if 'SYMBOL TABLE' in line:
|
|
syms_started = True
|
|
line = None # Otherwise code coverage complains about 'continue'
|
|
continue
|
|
if re_syms and not re_syms.search(line):
|
|
continue
|
|
|
|
space_pos = line.find(' ')
|
|
value, rest = line[:space_pos], line[space_pos + 1:]
|
|
flags = rest[:7]
|
|
parts = rest[7:].split()
|
|
section, size = parts[:2]
|
|
if len(parts) > 2:
|
|
name = parts[2]
|
|
syms[name] = Symbol(section, int(value, 16), int(size,16),
|
|
flags[1] == 'w')
|
|
|
|
# Sort dict by address
|
|
return OrderedDict(sorted(syms.items(), key=lambda x: x[1].address))
|
|
|
|
def GetSymbolAddress(fname, sym_name):
|
|
"""Get a value of a symbol from an ELF file
|
|
|
|
Args:
|
|
fname: Filename of the ELF file to read
|
|
patterns: List of regex patterns to search for, each a string
|
|
|
|
Returns:
|
|
Symbol value (as an integer) or None if not found
|
|
"""
|
|
syms = GetSymbols(fname, [sym_name])
|
|
sym = syms.get(sym_name)
|
|
if not sym:
|
|
return None
|
|
return sym.address
|
|
|
|
def LookupAndWriteSymbols(elf_fname, entry, section):
|
|
"""Replace all symbols in an entry with their correct values
|
|
|
|
The entry contents is updated so that values for referenced symbols will be
|
|
visible at run time. This is done by finding out the symbols offsets in the
|
|
entry (using the ELF file) and replacing them with values from binman's data
|
|
structures.
|
|
|
|
Args:
|
|
elf_fname: Filename of ELF image containing the symbol information for
|
|
entry
|
|
entry: Entry to process
|
|
section: Section which can be used to lookup symbol values
|
|
"""
|
|
fname = tools.GetInputFilename(elf_fname)
|
|
syms = GetSymbols(fname, ['image', 'binman'])
|
|
if not syms:
|
|
return
|
|
base = syms.get('__image_copy_start')
|
|
if not base:
|
|
return
|
|
for name, sym in syms.items():
|
|
if name.startswith('_binman'):
|
|
msg = ("Section '%s': Symbol '%s'\n in entry '%s'" %
|
|
(section.GetPath(), name, entry.GetPath()))
|
|
offset = sym.address - base.address
|
|
if offset < 0 or offset + sym.size > entry.contents_size:
|
|
raise ValueError('%s has offset %x (size %x) but the contents '
|
|
'size is %x' % (entry.GetPath(), offset,
|
|
sym.size, entry.contents_size))
|
|
if sym.size == 4:
|
|
pack_string = '<I'
|
|
elif sym.size == 8:
|
|
pack_string = '<Q'
|
|
else:
|
|
raise ValueError('%s has size %d: only 4 and 8 are supported' %
|
|
(msg, sym.size))
|
|
|
|
# Look up the symbol in our entry tables.
|
|
value = section.LookupSymbol(name, sym.weak, msg)
|
|
if value is not None:
|
|
value += base.address
|
|
else:
|
|
value = -1
|
|
pack_string = pack_string.lower()
|
|
value_bytes = struct.pack(pack_string, value)
|
|
if debug:
|
|
print('%s:\n insert %s, offset %x, value %x, length %d' %
|
|
(msg, name, offset, value, len(value_bytes)))
|
|
entry.data = (entry.data[:offset] + value_bytes +
|
|
entry.data[offset + sym.size:])
|